318 compression calculator with KB167

Hi all,
I have been using this compression ratio calculator and would like to know that I am entering the numbers correctly.

The KB167 pistons say +5cc but I have read that they should be entered as -5 for dished pistons?

Please see image attached. I am aiming for around 10:1.
This is assuming a piston to deck height of .012 and a .030 over bore.

Does this look correct or should I have the piston cc's as a positive?

Thank you....

318 compression calculator with KB167
Author: admin